Java/Игра змейка/Snake.java

Материал из Викиучебника

/************************************************************
 ** Title:  Игра змейка 
 ** Class:  Snake
 ** Author: Oleg Imanilov
 **   Copyright (c) 2007 Oleg Imanilov.
 **   Permission is granted to copy, distribute and/or
 **   modify  this  document under  the  terms  of the
 **   GNU Free Documentation License
 ** Notes: класс змейки
 ************************************************************/

package game.snake;

import java.awt.*;
import java.util.ArrayList;

public class Snake {
  public static final int DIR_POUSE = 0;

  public static final int DIR_UP = 1;

  public static final int DIR_RIGHT = 2;

  public static final int DIR_DOWN = 3;

  public static final int DIR_LEFT = 4;

  private ArrayList<Point> body = new ArrayList<Point>();

  private int bodySize;

  private int direction = DIR_POUSE;

  public int getDirection() {
    return direction;
  }

  public void setDirection(int direction) {
    this.direction = direction;
  }

  Snake(int x0, int y0, int sz) {
    bodySize = sz;
    int x = x0 * sz + 2;
    int y = y0 * sz + 2;
    for (int i = 0; i < 3; i++) {
      body.add(new Point(x, y));
    }
  }

  public void paint(Graphics2D g2) {
    for (Point p : body) {
      g2.setColor(Color.green);
      g2.fillArc(p.x, p.y, bodySize, bodySize, 0, 360);
      g2.setColor(Color.magenta);
      g2.drawArc(p.x, p.y, bodySize, bodySize, 0, 360);
    }
    Point p = body.get(body.size() - 1);
    g2.setColor(Color.black);
    g2.fillArc(p.x + bodySize / 2 - 2, p.y + bodySize / 2 - 2, 4, 4, 0, 360);
    g2.setColor(Color.white);
    g2.fillArc(p.x + bodySize / 2 - 1, p.y + bodySize / 2 - 1, 2, 2, 0, 360);
  }

  public Point move() {
    Point last = body.get(body.size() - 1);
    Point pp = last;
    switch (direction) {
    case DIR_POUSE:
      break;
    case DIR_UP:
      body.remove(0);
      pp = new Point(last.x, last.y - bodySize);
      body.add(pp);
      break;
    case DIR_RIGHT:
      body.remove(0);
      pp = new Point(last.x + bodySize, last.y);
      body.add(pp);
      break;
    case DIR_DOWN:
      body.remove(0);
      pp = new Point(last.x, last.y + bodySize);
      body.add(pp);
      break;
    case DIR_LEFT:
      body.remove(0);
      pp = new Point(last.x - bodySize, last.y);
      body.add(pp);
      break;
    }
    return pp;
  }

  public int getSpeed() {
    return 250;
  }

  public void expand() {
    body.add(0, new Point(body.get(0).x, body.get(0).y));
  }
}